Hi Spehro!

On Wed, 12 Mar 2003, Spehro Pefhany wrote:

> http://www.ti.com  Power Trends, now part of Texas Instruments.
>
> e.g. PT78Sxx series, but there are dozens of part numbers.
>
> They are NOT cheap, about FIFTY times the price of a 78xx regulator
> (not counting heatsink). Don't spec these in a volume product if you
> value your job and are not working for the military.

There's more to cost, -especially- in volume, than just that one part.
Consider all the cost/space values of possibly leaving the fan out of a
design because the regulator might be the largest or even only
(significant) heat producer. 1) fan cost, 2) using a smaller enclosure
because there's no fan, 3) no fan cutout (molding design/fab costs), 4) no
fan and associated wiring parts assembly, 5) never having to worry about
the fan failing (including fail sensor (temp or fan power) and associated
failure/shutdown hardware/software).

The cost of these power parts will also likely drop like a brick over a
few years, so take future cost into account too. Less important of course
if the life if the product isn't expected to be even that long which is
all too common today.

I'm not disagreeing with you, just adding to the perspective.

Have a :) day!

jb

--
jim barchuk
jb@jbarchuk.com

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